Recording watt-meter



(No Model.)

Y Wi C.. FISH.

RECORDING WATT METER.

No. 534,640. Patented Feb. 26, i395..

WE S@ MMWCEH A Wfl# @l M MW y Nrrnn Srnrns WALTER C. FISH, OF LYNN, ASSIGNOR TO TI-IE THOMSON-HOUSTON ELEC- TRIO COMPANY, OF BOSTON, MASSACHUSETTS.

RECORDING WATT-METER.

SPECIFICATION forming part of Letters Patent No. 534,640, dated February 26, 1895.

Application filed Derember Z2, 1894. Serial No. 532,633. (No model.)

To @ZZ whom it may concern:

Be it known that I, WALTER O. FISH, a citizen of the United States, residing at Lynn, count-y of Essex, State of Massachusetts, have invented certain new and useful Improvements in Recording VVatt-Meters, of which the following is a specification.

This invention relates to recording watt meters, and has special reference to improvements in a meter shown and described in United States Patent No. 448,894, dated March 24, 1891, granted to Elihu Thomson.

The object of the present invention is to provide an improved meter of this character by means of which very large currents may be measured, such, for instance, as represent the entire output of a dynamo at the central station, while securing at the same time accuracy in registration, economy of construction, and an apparatus which can be easily installed.

The principle of operation of the present improvement is like that of the meter in the patent above referred to and only so much of its construction and operation will be described as will be necessary to a clear understanding of the present invention.

Referring to the accompanying drawings, Figure 1 is a perspective face view of a meter constructed in accordance with this invention. Fig. 2 is a diagram illustrating a Way of connecting up the circuits of the meter.

A indicates the insulating base of the meter, and B, B two very heavy binding posts which lead backward through the insulating base A and connect respectively with the ends of one of the main conductors cr omnibus bars, which is divided at this point for this purpose.

To the front end of the binding posts B, B, and firmly, mechanically and thoroughly electrically secured thereto, as by a double joint, as shown, is placed aA U-shaped conductor D having a conductivity sufficient to convey the maximum current which will at any time ilow through the main in which it is connected. Upon these binding posts, B, B is carried the entire mechanism of the meter, as follows: Secured to the upper part of the binding posts B, B and bridging the same is an arch E, which serves as a support for the registering mechanism F, as is clearly shown, and which also carries the upper bearing for the armature shaft, hereinafter to be referred to. This arch E is insulated from the binding posts B, B, by means of the insulation E of hard rubber or its equivalent. From the lower part of the binding posts B, B, there extend downwardly two posts G, G, united at their lower ends by a base plate II, arranged to hold in 6o proper position the permanent magnets I, I, I, which act upon the damping copper disk K serving as a retarder, as set forth in said Letters Patent No. 448,894. In this plate Il is also located a lower jeweled bearing for the armature shaft L arranged as described in said patent. Upon the armature shaft L is mounted the armature M, constructed as set forth in said Letters Patent, or otherwise as may besuitable, which armature revolves in 7o the field produced bythe U -shaped conductor D. The movements of the armature are registered or counted by the registering mechanism F geared to the armature shaft L. The posts G, Gr, are insulated from the binding posts B, B by means of the insulation G of hard rubber or its equivalent. The same set of bolts o may be used to hold both the upper and lower structures in position. The damping copper disk or retarder K, carried by the 8o armature shaft L revolves past the poles of the permanent magnets I mounted on the base Aof the machine. The brushesN which convey current to and from the armature M, are made of considerable length and Wound as a spring adjacent to their support, preferably,

so as to bear upon the com mutator with a moderate and uniform spring pressure.

It will be seen that with this construction the. main field consists of simply three-quargo ters of a turn of the main conductor, and this is found in practice to be amply sufficient to furnish all the field required.

The instrument thus constructed may be mounted inside of a round or other shaped casing O provided with a glass front, and placed in a suitable position upon a switchboard or other support at the station, the binding posts B, B, providing all the support necessary. As shown in the diagram, Fig. 2, to. the armature of the meter is included in a shunt circuit across the bus bars or circuit mains P, I), the circuit being passed through the armature by a commutator and brushes N of ordinary construction. A resistance R will ordinarily be included in this circuit, and.

also a ield coil c surrounding the armature and furnishing an initial lield or a field Which gives torque to overcome the friction coefficient of the instrument at the lightest load. The starting coil, however, is not an essential feature of this instrument.

In cases Where very heavy currents are to be measured it is not always necessary to insulate the arch E and posts G G from the binding posts B B, as the diversion of current through these alternative paths is so slight as not to prevent the proper registry at the meter, and in such case the binding posts, arch, and posts G G may be made in one piece, if desired, or the arch and posts G G may be secured to the binding posts without being insulatedtherefrom. However, when permanent magnets are employed, as shown, itis usually best to insulate the posts G G to prevent the current passing through them from induencing the magnets or the disk D; or, instead, to make the posts of relatively high resistance material. v

Having noW described myinvention, What I claim as new, and de ire to secure by Letters Patent of the United States, is

1. In a motor meter, as herein set forth,the combination with Jan armature, of a U- shaped conductor forming the iield Winding, said armature being located Within the bend of the U-shaped magnet, and connected in shunt across the circuit mains.

2. In an electric meter, as herein described, the combination With an armature connected to a registering mechanism, of a U-shaped conductor having a conductivity sufficient to conveythe maximum current which will at any time flow through the main in Whichit is connected, the armature being located within the bend of the U-shaped conductor.

3. In an electric meter, as herein described, the combination With an armature and a heavy U-shaped conductor, as herein de scribed, of heavy binding posts to which the conductor is connected, an arch mounted on the binding posts and insulated therefrom and carrying the registering mechanism, and a retarding device. 4. In an electric meter,as herein set forth,an armature and registering mechanism, and retarder connected With the ends ot' the armature shaft, in combination with a Ushaped conductor, as herein described, having binding posts by which the U-shaped conductor is supported, and a metallic arch carrying the registering mechanism and mounted on the binding posts and insulated therefrom.

` 5. The combination with the recording mechanism of an electric meter, of an armature connected in shunt across the circuit mains, and a conductor comprising less than a complete turn in series with one of the circuit mains and in inductive relation to said armature.

6. The combination in an electric meter, of a set of binding posts adapted to be connected to the terminals of one of the omnibus bars from a -current generating source, a main field conductor connected between and supported by said binding posts, supports also carried by said binding posts and serving to sustain the regulating and registering mechanisms, respectively, and an armature carried upon a shaft having bearings in said supports.

7. The combination in an electric meter of a set of binding posts adapted to be connected to one of the omnibus bars from a current generating source, a main field conductor connected between and supported by said binding posts, and supports for the movable elementot the meter also carried by said binding posts.

In witness whereof I have hereunto set my hand this 14th day of December, 1894s.

p Y WALTER C. FISH. Vitnesses:

JOHN W. GIBBONEY, ELIHU THoMsoN. 

